<div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">вт, 30 апр. 2024 г., 12:01 Mat via Cin <<a href="mailto:cin@lists.cinelerra-gg.org">cin@lists.cinelerra-gg.org</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The radio signals which are interfering could be shortwave. <br>
<br>
I would recommend using ferrite clamps on the cables which do not carry<br>
digital signals, especially those in the most sensitive area, like<br>
from the hydrophone and pre-amp. Also the pre-amp power cable, if it is<br>
not battery powered. </blockquote></div></div><div dir="auto"><br></div><div dir="auto">*I think* preamp in this case is battery-powered.</div><div dir="auto"><br></div><div dir="auto">By ferrite rings you mean like those?</div><div dir="auto"><br></div><div dir="auto"><a href="https://www.ebay.com/itm/403346040770">https://www.ebay.com/itm/403346040770</a><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">And screen the pre-amp, if it is not in a metal<br>
box. The pre-amp itself ought to have provisions for preventing this,<br>
like a low-pass filter at the input.<br>
<br>
MatN<br>
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</blockquote></div></div></div>